[REF] travis_install_nightly: cryptography upgrade (#345)
[REF] travis_install_nightly: cryptography upgrade (#345)

In order to fix `AttributeError: module 'lib' has no attribute 'X509_get_notBefore'`

On very next day Cryptography module was updated. Acknowledging that some
legacy symbols needed to be restored back.

From https://cryptography.io/en/latest/changelog/#v37-0-1
37.0.1 - 2022-04-27¶

Fixed an issue where parsing an encrypted private key with the public loader
functions would hang waiting for console input on OpenSSL 3.0.x rather than
raising an error.

Restored some legacy symbols for older pyOpenSSL users. These will be removed
again in the future, so pyOpenSSL users should still upgrade to the latest
version of that package when they upgrade cryptography.

pip install --upgrade "cryptography<=37.0.1"
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